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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e256f05789caab84e9f6b201cf994f73640e29c863b70dc94a170252b702cba9' 
  AND token = 'fWFdjCrMNtlA2cu9cIiK13aKElJMz5dIcEMCc5LLzYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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