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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b8daa34f9325ba00323e2ed92e875bc44ba52ba94562693138b0ce836354bcee' 
  AND token = 'htTYY14zaFI2JnVMQiPhhjxfW1wLJWp2MNZGyU28KOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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