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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a4bbb4d3b71770e4b85aca0d510ed6922a7658efce86ae1508a25fe8f0fae04' 
  AND token = 'xm4ZQi626kZ8BOBWXOtWmoDIBAKD3H9zOXz+xy450n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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