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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '869e6275e4e557df0e0f4109c16d60d17824e5f9936aed54b4be2f92e63ea6cb' 
  AND token = '+Rncw+J+betzTEXpWekhzDUUxHF5AhuXN0hAMTdBkjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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