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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ed5dab8b4b909a095b965c512795fcd3aa621e454be6c2d360ff6e7c3da516fb' 
  AND token = '7T8Vxh9tjp1niNECNheaWyZ3TQ+slyaiXtTK7y8lDB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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