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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd3e41d5e18adda7dd5f7af18862f8383fc58b8d6b20edc3559246400bb0893b' 
  AND token = 'fsu6yLT/yAlxYiiWh0ldRM0wrTc24G4jM4TaIW+x1uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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