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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9088d6d95591094606857efc5405382814842601b1ed0595daefe26e7c85a562' 
  AND token = '9pZKOnT8y+i6rA8jOpcMs0HV3J5taqkhXBBZPk9/RZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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