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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bcf4ab25d2cd348475ba37f80979f34799edc9cf2b224e368c07c6dba1c24ec0' 
  AND token = 'PTR+S63YsGa+aIIYudHY73B6NcTIBC252u1YM9+8ha0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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