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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd58a622b48435f96837940dc6e95d78cd261bb53fb422e420d85a3c8648f369b' 
  AND token = 'unvaIES0Y/1hOQJkPhsXyS0OOmmR3eoz2NBhdCmdNi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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