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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '74e48ba2340178bec0411e245c904ae35bf4e90589717eb518e8294a6d59118b' 
  AND token = 'UYq/ksYdlUhU9WQJYa3UT7hp2/9DztTg9B9K2jB3+a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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