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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2af352dda1b63d2241f0470c3aadd6a88c0f23eb1548daa3f3830483beb9d677' 
  AND token = 'g53e1eAx74FnKoxuoyqzMDcx6FwzuV5LXH7YLGF03LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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