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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7c8ca8b02e2adc4592d5dcae91af0cd8e48e2d9ad7703a12e58b872a137f7413' 
  AND token = '5VMf1sRSCKetJ6CgjaFpetzZ4j0Ye0DEmUysphJODcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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