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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bd66ce661ebc6093e35996c485e160afac48d1a1e8af337f82ac2bb185681b8d' 
  AND token = 'pZ4DH4S1co+tBUJaIlgkqAI+oPvWbjJxJuPuDbKDx3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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