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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '20f504d25f5373b51c86927c5b9295bb2cd6985db2de2ba99cca204aa08b1828' 
  AND token = '+5Cf0D1wNtZQ4fWrceHVBjdx0YoxsOdwVKwxKRJ0OqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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