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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '25e2c6fb6811af8942159cace7b5ca0e97d50004feb8e4acae2690062ef762fd' 
  AND token = 'G1OwFRJ8cvVlj269exksUa5S5utwAA3q+F9jp7Clq3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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