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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2da170a57286c8a0178fb3b96ab747cdbdb73da148d59d2598820bd6d542d7cb' 
  AND token = '/3/BpBtldgarm1tkh48BvITtq7Xa/UxQbki/uYdlxE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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