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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '070fa855ea9e6ced3b209a277260b7387eb0c30a9918a23e1b0fa675d0d8fdcc' 
  AND token = '8LQe8pHw5FcdewEgZwdv2UD8U3aOyULUCE7RhgVtq9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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