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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a9d2ba97f25555b16e60796bec9eecde018878a1e2065a2ee88ab4299046d877' 
  AND token = 'dyP2hZg+RCFefgSXQXnMdPPTcaVUQFOXDe8RKBoc3WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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