SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'afd348cc2e6b89d2d3275501d8fb096ca3c5e1796ba63a6b329bbab62f6ac7da' 
  AND token = '9s/iN4mUhDWgM4NYZQuJZx739o/xGrIH+ig3FwGyYaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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