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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e99694663e6d8405b53f6bb602b8855da70c0450286e9e924aee9cff2410b585' 
  AND token = '5NkO6fyfZsS31v+zTXFg4ZRseKZ6DZBSqYhSiQO1Fb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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