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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ff68d3e4773a31cad3482e337aaa21a7df6390d9261b326a32f10d31236e5535' 
  AND token = 'fyuTtE/H2cxV+8rZcfwITiNFTDmH0aCRFjvgp0iiFyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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