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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9665091f557b3ba3a681b5af36a7f881b826e9116a19ab1882d90e918bbb1ec1' 
  AND token = '6URducVZZ7sCTGtbGGUSrg+pGiErCQkeyA9dj8Mkgc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}