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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c4617d95908963f91ea66b76352f0531660f1c82eaf9d0101668ad1f4ee16e3c' 
  AND token = 'mj7NzCFLVmZuGnRq5T4Vxr9opCXP5+Ntdie3O2FAjrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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