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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5039e93c666681074b403dbd49547c6dc613b0803b3c73b5abfec1b24db238e' 
  AND token = 'RCHRXQ0oVuU0ffv0WlOw190T32oZQ7p3/e8vG6G0pic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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