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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd00625d7d81a9d70da15bf5f2f3e5e63c3c9c46cd4c8d5abf343a6b27304c54d' 
  AND token = 'tpCJyjscnrKJ4b4FI/idHMuWTz4uUg6ROhJfdXMg5dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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