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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6e1ea6290aaf7037aca415ea1f8a4530a3d70f9e3233acc1247339a51881a57a' 
  AND token = 'jKrn4G0IiZJXTPA6xXfiNdkhtaNhUmk4jWGHSH694TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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