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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '83033a201f8933ae8fd86dfa2178811a801271ef3ae6cb5d0577aed9b204112f' 
  AND token = 'i2dM0W2GTKQOsBKL0NOTxOEp4x1J/03ppPRxeNHw5uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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