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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a0a926ac6117ea248c9e3e11672e7b25bcbd3c0a219e9c66c09356f6ff27cfad' 
  AND token = 'LfbqxkMVf5ota0/H37MY4Xd32Zswbe+xGCS/eM8zv/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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