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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ed2cf0e067b8f5d5284da4f0cfa38efe21c79bb7177a7cf696d3309968c1da15' 
  AND token = 'mVEbDE19RsUR95fCmuuym9MfXwDqyneoujoAN/aJpIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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