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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b49aa779791baf5f9ed633ff563c49ab622199c1d22b9dbc74c50140c8acbbef' 
  AND token = 'qZh6zX3H3MnH935fHNzS9NIn9BBm2K/uFluHxVS7Bc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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