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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6793510af058ea9c1bad2a8e1ad7507d770dab07c00250e93be85d2d0e108e3f' 
  AND token = '7VXgxKbhsJEJCXPtB6w2XWY1iGj8ChNWBT1jwBtYwsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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