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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02b040e06b24f883393eee2d04cb398a9a52169f9412639cb6d6c0d9b35f9757' 
  AND token = 'vmIMdXpvMYZdPxglhzurtwuNAyInlexZru9xh9XRzy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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