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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd4dcf4b76a7d16c5b9bd7a1f5d14cb7fc7e2adf5ebf99c8fc5157da4b6088a8' 
  AND token = 'T/jS2rpm2CKRPA7I7UHIyqj+Ns7l/YEdzaLn1RLYwLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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