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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5cf3624c8c989a29a0808b317dce2839dca474b8657acd5d0079f2d816959041' 
  AND token = '743+Udr0kKTKodP5VzvB8VLE3cyCj+oZ5ZMK5y8Ae7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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