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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'abc851762ad974cf1e8f7bdaf70a5908b70c36af7abde094375a96d93371ec26' 
  AND token = '2Ais2WQKYjsdulrBk9EgeKRvjebVnPqrDeIlF2OAVoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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