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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '598027f689088ec97cde656fad171f6bbad076d9ca9b6344843f0e441290b6b5' 
  AND token = 'gW9QDdlXea+TdDT6aEpTc5XvrxAs9seLwBKZr2uHrNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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