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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '030fe210e5574b3972f7f49a2c408ba4e396a190e0ce7f922c4e0aa9501468d2' 
  AND token = 'phT6amI1lmQ3365cqsqDkbtLiF6Vo4tMoZuHyYS32uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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