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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2913a5d59691fe40cc9867c9a13fd022ea8e152d6cecf20a74565a29ed1ace44' 
  AND token = 'srRkkE2jwsz0U/mU7qQmt5PcJrrkKhH9kwh29dk74lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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