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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5a243c402bbd2b96302677f60efe6288a76230b70928cb27c4cf6f3aa6d65bad' 
  AND token = 'J0QFWLEMurjlH+KXlg8AW99FLxPEmSAFdit5wNMgb4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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