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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fcdd25569eeeaa82cf4186796a77c2aa3450752b0506ee9afb6ba8ce4703f8ae' 
  AND token = 'WM5JyJ1NUzz0ZdW2I0/E66eoCid1KIL4cSf/jA/GlRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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