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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '17978d8bebc574abb512629e385b39a276b9947633a8371298026d1dbf913c35' 
  AND token = 'jWAtyTp1jdH3s3McPpWuJI9+AkO1d8ecfifmn8hC4Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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