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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '028495b653905e63e69c8f6f047d3722b9fafa13a2cf97ae6d9aedaa13578183' 
  AND token = 'fr5NwhQsjusJEDTfFUx92v0GA6PGXHusA9GQjdwFetI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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