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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f128add8c8671549551e526dd10f43ded771d519369de76a3b0201a63b91bf63' 
  AND token = 'dv2XnY8a7aiPN5P8ohJinEai4lT9zNJ3KEJEBmRQGmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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