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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e0722851f305397f80c385bcfc73acf8e65c25f520fa4b32f333a4a5ea2ee802' 
  AND token = 'vo3DdqhLppN0YZ8naL/muLqebu97+YpRF/skFjV86Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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