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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9460998b128c6f6c6bf097d2242d7b8dc792c4102099f1437ce90670e3bc2f6' 
  AND token = '6ndEiUwkH66Itv1Wkpikxqhi4v9VPWqD7lVko5+0OVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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