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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a7b5d50e592159603f3fad0b1d1b39139a5e0ada78723df7fb39bf7a3ef19535' 
  AND token = 'Sxq9ZuVOnmr/2vNJT7XBYczL2agGJefjdOEXaNsvW4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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