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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2146a0af3a9bf67cbad417725f719f8afa3af12c3fbe6f81dc966b64822fd443' 
  AND token = 'oFo/1UD5vVxOGSfj73sU3EAnnarPiriGmOWnXYHNBV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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