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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '444c49ae98fd054f9d3a1aead6058bbcd90bb85e12185a6b633dc7ec73d5d059' 
  AND token = 'XXrUOE6VT4P0n2YPuQ6BcnFRRCux/rzEzUZB07NbMZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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