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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7f60baf11abcec48cd86ca51a33b1531e54c8878b9d0c832ac494a2adb5240ee' 
  AND token = 'kOyQxzhIGumR6t85GAJYMnoJWVVyPT4ZbegVFtJhvQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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