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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9099de3ef463f9710d7a87b479e0391ca05d93291327a6da5943234abd47ccf3' 
  AND token = 'oyY7XNpvriXfqu/SXc6nkhaV6hkszVm6W6ylnWmDKX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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