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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4fcb57a87e1e60e181c33300b047d0ed08341429020e1cb685b4a76813504530' 
  AND token = 'XfT8BA8eQAT/FvyDA2qcs7njTknviqKCh3vGJ0Zx7Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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