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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7c3c6cea1dc38172cc90993447bef8756dd8668c7c57f565f3119ce37abb3795' 
  AND token = 'zFlyBU4otWCWQzD6mG2dRWsPpYXD7Rt76N94L23A48U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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