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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aa3c6a371685fa684ed51afb6a35bb9f2e292b8809550267c1b6f5e18a482949' 
  AND token = 'hSeQoQ4vyHtAjm9GpV2QVdkoQmdm+gibt3GTrI/igXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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