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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7b4183f55b8963cf9788d4a81801043bb843e5edb0330b77a3e87f75318f7a7d' 
  AND token = 'GoFjHvvAMGukH24cypw+3YO5dHf1AE402/yUvhdVQ/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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