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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6d04e33445ba5d6be85bee8e2fad6318d83ba1b3a2a15e9487c7d132060e9f98' 
  AND token = '7a7YdthrjZHL0ueada5zs37Wfv0m5tGL5BrBA9ck75U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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