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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '89dbe73bbdb89c92ac32c02816d907c8b5ee20dfab7fea7273093dd50bdec547' 
  AND token = 'miMidEw/sT3mvZnOZs0jY52XBNEIuBSTJertWWCrlYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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