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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c7dd6872c3aae992c6f4d5db06049f541cbca7ce7b52bfd953339e6b3f07fe6a' 
  AND token = 'nn2zWnuu6pZ12O5GpifEccasOGBhW17rA7uEnsK1pPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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