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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f23e0d1518a2325b06ea57bc01dbcdb13a987b21428a82587bc457108383e197' 
  AND token = 'sMjc42jvNhEmp4aNfEtAk23atMU7NYkPZEuzDnYD9SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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