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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd26a4cf297640b60d7b829ddd63d4135f7abc6caea5cff2b7b2542fbfd0c2c5a' 
  AND token = 'hFA5Pf1Txi2l72gsL7bPymht+aK6yI8DUbxsQg2Su5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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